I believe the most important part of the walkie-talkie is the batteries you use and the quality of the walkie-talkie. If you do not have good batteries, you can not use it for very long. If you have a cheap walkie-talkie, you won't get a good signal or range.
If you google "barbie walkie talkie", you'll be presented with the "barbie glitz and glam" walkie talkie. Its available online for about $14. Its great for having conversations, making plans and gossiping with friends.